Actually, I understand "language police" in a non-learning sense. It relates to linguistic "law" (the phrase was first used in reference to Quebec's enforcing of French-language-only laws on the general public) and political correctness. If you've had a run-in with the language police, then that means somebody has probably told you that you didn't use the "appropriate" phrase or "your choice of words was wrong" - and your own words "might" offend someone. The fact is, whatever you had said was correct on a technical level. Like I said, this doesn't fit into a learning context to me. It's about people using a skewed sense of righteousness to bully others into speaking a certain way. Orwell's Newspeak. One case I remember was at Seaworld in The Gold Coast (Australia), where the management renamed their "fairy penguins" to "little penguins", because they thought the term "fairy" might be offensive to gay people. (Notably, no-one asked the LGBT community what they thought until later.)

haha, yea, that's not so important. it's more of a joke than anything else :) it just means they want to correct people all the time, but it's not important. they are not real teachers.

Aha, thx alex I understand. He was a linguist :).

I think it means someone who goes around correcting people's grammar and spelling. To me it usually refers to a single person and not a teacher or professor, but maybe it could also talk about someone in the media or something. Or at least not a teacher or professor in the context of a classroom.